/*
|
* Copyright (c) 2015 Pengutronix, Sascha Hauer <kernel@pengutronix.de>
|
*
|
* This program is free software; you can redistribute it and/or modify
|
* it under the terms of the GNU General Public License version 2 as
|
* published by the Free Software Foundation.
|
*
|
* This program is distributed in the hope that it will be useful,
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
* GNU General Public License for more details.
|
*/
|
|
#include <linux/export.h>
|
#include <linux/jiffies.h>
|
#include <linux/regmap.h>
|
#include <linux/soc/mediatek/infracfg.h>
|
#include <asm/processor.h>
|
|
#define MTK_POLL_DELAY_US 10
|
#define MTK_POLL_TIMEOUT (jiffies_to_usecs(HZ))
|
|
#define INFRA_TOPAXI_PROTECTEN 0x0220
|
#define INFRA_TOPAXI_PROTECTSTA1 0x0228
|
#define INFRA_TOPAXI_PROTECTEN_SET 0x0260
|
#define INFRA_TOPAXI_PROTECTEN_CLR 0x0264
|
|
/**
|
* mtk_infracfg_set_bus_protection - enable bus protection
|
* @regmap: The infracfg regmap
|
* @mask: The mask containing the protection bits to be enabled.
|
* @reg_update: The boolean flag determines to set the protection bits
|
* by regmap_update_bits with enable register(PROTECTEN) or
|
* by regmap_write with set register(PROTECTEN_SET).
|
*
|
* This function enables the bus protection bits for disabled power
|
* domains so that the system does not hang when some unit accesses the
|
* bus while in power down.
|
*/
|
int mtk_infracfg_set_bus_protection(struct regmap *infracfg, u32 mask,
|
bool reg_update)
|
{
|
u32 val;
|
int ret;
|
|
if (reg_update)
|
regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask,
|
mask);
|
else
|
regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_SET, mask);
|
|
ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1,
|
val, (val & mask) == mask,
|
MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
|
|
return ret;
|
}
|
|
/**
|
* mtk_infracfg_clear_bus_protection - disable bus protection
|
* @regmap: The infracfg regmap
|
* @mask: The mask containing the protection bits to be disabled.
|
* @reg_update: The boolean flag determines to clear the protection bits
|
* by regmap_update_bits with enable register(PROTECTEN) or
|
* by regmap_write with clear register(PROTECTEN_CLR).
|
*
|
* This function disables the bus protection bits previously enabled with
|
* mtk_infracfg_set_bus_protection.
|
*/
|
|
int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask,
|
bool reg_update)
|
{
|
int ret;
|
u32 val;
|
|
if (reg_update)
|
regmap_update_bits(infracfg, INFRA_TOPAXI_PROTECTEN, mask, 0);
|
else
|
regmap_write(infracfg, INFRA_TOPAXI_PROTECTEN_CLR, mask);
|
|
ret = regmap_read_poll_timeout(infracfg, INFRA_TOPAXI_PROTECTSTA1,
|
val, !(val & mask),
|
MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
|
|
return ret;
|
}
|
